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How to: Read a Binary File (C++/CLI)

The following code example shows how to read binary data from a file, by using two classes from the System.IO namespace: FileStream and BinaryReader. FileStream represents the actual file. BinaryReader provides an interface to the stream that allows binary access.

The code example reads a file that's named data.bin and contains integers in binary format. For information about this kind of file, see How to: Write a Binary File (C++/CLI).

// binary_read.cpp
// compile with: /clr
using namespace System;
using namespace System::IO;

int main() 
   String^ fileName = "data.bin";
      FileStream^ fs = gcnew FileStream(fileName, FileMode::Open);
      BinaryReader^ br = gcnew BinaryReader(fs);

      Console::WriteLine("contents of {0}:", fileName);
      while (br->BaseStream->Position < br->BaseStream->Length)

      fs->Close( );
   catch (Exception^ e)
      if (dynamic_cast<FileNotFoundException^>(e))
         Console::WriteLine("File '{0}' not found", fileName);
         Console::WriteLine("Exception: ({0})", e);
      return -1;
   return 0;